[0001] This application claims the priority benefit of Korean Patent Application No. 10-2004-0065078
filed on August 18, 2004 in Republic of Korea, which is hereby incorporated by reference
as if fully set forth herein.
BACKGROUND OF THE INVENTION
Field of the Invention
[0002] The present invention relates to a mobile broadcast receiver, and more particularly
to a method for decoding a broadcast service in a terrestrial mobile broadcast receiver.
Discussion of the Related Art
[0003] Recently, as high-quality digital audio devices such as a Compact Disc (CD) or a
Digital Versatile Disc (DVD) have rapidly come into widespread use throughout the
world, demands of listeners who listen to digital broadcast data requiring high-quality
audio data (i.e., high-quality sound) have also been rapidly increased. Therefore,
in order to obviate a limitation in improving the quality of audio data for use in
a typical Frequency Modulation (FM) broadcast service, a Digital Audio Broadcasting
(DAB) system has been widely used in many countries, for example, the United States,
Europe, Canada, etc.
[0004] The DAB system provides a user with high-quality audio data using a technology different
from those of typical Amplitude Modulation (AM) or FM broadcast systems, has superior
reception ability while in motion using this technology, and can transmit digital
data such as video or audio data at high speed. In recent times, a variety of multimedia
services including both audio data and video data have been generally called a Digital
Multimedia Broadcasting (DMB) service. In other words, the DMB service can provide
users with high-quality audio data (e.g., data of CD) and high-quality video data,
and can also provide the users with a superior fixed reception quality or a mobile
reception quality.
[0005] The Eureka-147 system has been developed for the above-mentioned DAB service, and
has been considered to provide a terrestrial DMB capable of providing users with small-sized
moving images. The Eureka-147 system includes a packet mode and a stream mode, such
that its configuration can be extended to transmit multimedia data according to individual
modes. Therefore, the multimedia data can be transmitted to a destination on the condition
that the conventional terrestrial DAB system is slightly changed to another configuration.
[0006] The above-mentioned Eureka-147 system can construct a single broadcast service composed
of a plurality of service components, can multiplex a plurality of broadcast services
into an ensemble, and can transmit the multiplexed result via a specific frequency
band of about 20MHz.
[0007] The above-mentioned configuration of a DMB system according to a related art is shown
in Figure 1.
[0008] Referring to Figure 1, a single service is composed of one or more service components,
and a single ensemble is composed of one or more such services. In an example, the
ensemble of Figure 1 is composed of at least three services: "ALPHA 1 RADIO", "BETA
RADIO" and "ALPHA 2 RADIO". Each service is composed of two or three service components.
[0009] A service component is indicative of a variety of service components of a broadcast
service, for example, video data, audio data, traffic information, or broadcast service
information. The service corresponds to a broadcast, and a single service is composed
of one or more service components. Individual sub-channels (e.g., Sub Ch a, Sub Ch
b,..., Sub Ch 63) of a Main Service Channel (MSC) and a Fast Information Data Channel
(FIDC) may be used as the above-mentioned service components.
[0010] The ensemble is modulated into another ensemble according to a predetermined method,
and the modulated ensemble is generally transmitted via a single frequency band of
2MHz. The service component is connected to a sub-channel on a one-to-one basis. For
the convenience of description, the service component, instead of the sub-channel,
is mainly described in the present invention.
[0011] The above-mentioned Eureka-147 system also includes a Multiplex Configuration Information
(MCI). The MCI indicates a service multiplexed into the ensemble, service components
contained in individual services, and position information of the service components.
The MCI and service information (SI) are carried on a Fast Information Channel (FIC)
which includes the FIDC.
[0012] The Eureka-147 system repeatedly transmits data in frame units. A transmission frame
according to a related art includes a synchronization channel, a FIC (Fast Information
Channel), and a MSC (Main Service Channel) as shown in Figure 2.
[0013] The synchronization channel has a predetermined configuration to allow a DMB receiver
to recognize an initial frame. A null symbol and a Phase Reference Symbol (PRS) for
modulation/demodulation of DQPSK (Differential Quadrature Phase Shift Keying) are
assigned to the synchronization channel.
[0014] The FIC includes a plurality of Fast Information Blocks (FIBs), and is adapted to
transmit information for receiving a broadcast service. The MSC includes one or more
CIFs (Common interleaved Frames), and is adapted to transmit a broadcast service including
video data, audio data, and other data, etc.
[0015] The FIC includes specific data indicative of a structure of data received from the
CIF contained in the MSC. Each CIF includes actual data, for example, video data,
audio data, etc. The number of FIBs loaded on the FIC and the number of CIFS loaded
on the MSC are changed according to a transmission mode. For example, if the transmission
mode is set to "I", the FIC includes 12 FIBs, and the MSC includes 4 CIFs. The DMB
receiver decodes data in CIF units, such that it can provide a user with video and
audio services.
[0016] According to the related art, each FIB is composed of a plurality of Fast Information
Groups (FIGs) as shown in Figure 3. A single FIB is composed of 256 bits. In this
case, data can be received in the first 240 bits (i.e., 30 bytes) among the 256 bits.
Therefore, the length of a FIB corresponds to 32 bytes including 30 bytes of a FIB
data field and 2 bytes of a Cyclic Redundancy Check (CRC).
[0017] Each FIG received in the FIB is divided into a FIG header and a FIG data field. The
FIG header can carry information on the type of the corresponding FIG and length.
In this case, the above-mentioned FIG length is variable, but it must not exceed 30
bytes although it includes a header.
[0018] The following Table 1 shows a variety of FIGs.
[0019] [Table 1]
FIG Type Number |
FIG Type |
FIG Application |
0 |
000 |
MCI and part of SI |
1 |
001 |
Labels, etc.(part of the SI) |
2 |
010 |
Reserved |
3 |
011 |
Reserved |
4 |
100 |
Reserved |
5 |
101 |
FIC Data Channel (FIDC) |
6 |
110 |
Condition Access (CA) |
7 |
111 |
In House (Expert for Length 31) |
[0020] Table 1 indicates a variety of information differently loaded according to FIG types.
For instance, MCI (Multiplex Configuration Information) indicative of an ensemble
structure, individual services, and service component information is set to a FIG
type of zero (0).
Other Service Information (SI) is set to a FIG type of 1. FIDC is set to a FIG type
of 5. CA information is set to a FIG type of 6.
[0021] As discussed above, the ensemble defined by the Eureka-147 system may have a variety
of services multiplexed therein. Each service may have a plurality of service components.
Data, which may be used as the above-mentioned service components, is transmitted
via the FIC or the MSC. Ensemble configuration information, individual service configuration
information, and service component - associated information are contained in the MCI.
The MCI is loaded on the FIG(s) having the FIG type of 0 in the FIC, and is then transmitted
to a destination. A single service may have a maximum of 12 service components, and
the number of services contained in a single ensemble is not limited.
[0022] According to the related art, a FIC decoder in the DMB receiver must store and manage
all kinds of information contained in an ensemble to provide a service in the ensemble.
[0023] For example, if the user selects a specific service of "BETA RADIO" contained in
the ensemble structure shown in Figure 1, the FIC decoder must pre-recognize how sub-channels
of the MSC are classified. Also, the FIC decoder must recognize not only sub-channel
IDs of two service components (e.g., "DMB-1" and "2
nd-ry Audio") contained in the "BETA RADIO" service, but other information such as data
type (i.e., DMB data and audio) of individual service components. The FIC decoder
then transmits the DMB-1 data and secondary audio data to a TP (TransPort) decoder
and an audio decoder according to the above-mentioned information.
[0024] In this case, in order to recognize the above-mentioned information, the FIC decoder
must manage and process information associated with all services included in the ensemble.
However, the number of services contained in an ensemble and an amount of information
associated with the service components are numerous and limitless, such that the FIC
decoder has difficulty in managing all the information associated with all the services
contained in the ensemble.
SUMMARY OF THE INVENTION
[0025] Accordingly, the present invention is directed to a mobile broadcast receiver and
a method for decoding a broadcast service, which can decode/manage only information
associated with a user-selected service among a plurality of services.
[0026] An object of the present invention is to provide a mobile broadcast receiver and
a method for decoding a broadcast service, which overcome the limitations and the
disadvantages associated with the
related art.
[0027] Additional advantages, objects, and features of the invention will be set forth in
part in the description which follows and in part will become apparent to those having
ordinary skill in the art upon examination of the following or may be learned from
practice of the invention. The objectives and other advantages of the invention may
be realized and attained by the structure particularly pointed out in the written
description and claims hereof as well as the appended drawings.
[0028] To achieve these objects and other advantages and in accordance with the purpose
of the invention, as embodied and broadly described herein, a mobile broadcast receiver
according to an aspect of the invention comprises: a receiver for receiving a transmission
frame including a synchronization channel, a Fast Information Channel (FIC), and a
Main Service Channel (MSC), configuring the received transmission frame in the form
of a stream, and generating the resultant stream; and an FIC decoder for analyzing
Fast Information Group (FIG) information of a Fast Information Block (FIB) contained
in the FIC from among a stream generated from the receiver, extracting information
associated with a user-selected service and other information associated with service
components of the user-selected service, filtering only service components of the
user-selected service from among the stream using the extracted information, and transmitting
the filtered result to a corresponding process block.
[0029] In another aspect of the present invention, there is a method for decoding a broadcast
service of a mobile broadcast receiver, which receives a transmission frame composed
of a synchronization channel, a Fast Information Channel (FIC), and a Main Service
Channel (MSC), and decodes the received transmission frame, the method comprising
the steps of: a) analyzing Fast Information Group (FIG) information of a Fast Information
Block (FIB) contained in the FIC from among a received stream, and extracting information
associated with a user-selected service and other information associated with service
components of the user-selected service; and b) filtering only the service components
of the user-selected service from among the stream using the extracted service and
service component information, and decoding the filtered result.
[0030] According to an aspect of the present invention, there is provided a mobile broadcast
receiver comprising: a receiver to receive a fast information channel (FIC) and a
main service channel (MSC); and an FIC decoder to analyze fast information group (FIG)
information of a fast information block (FIB) contained in the FIC, to extract information
associated with a user-selected service and information associated with at least one
service component of the user-selected service, and to filter only the at least one
service component of the user-selected service based on the extracted information.
[0031] According to an aspect of the present invention, there is provided a method for decoding
a broadcast service of a mobile broadcast receiver, which receives a fast information
channel (FIC) and a main service channel (MSC), the method comprising: (a) analyzing
fast information group (FIG) information of a fast information block (FIB) contained
in the FIC, and extracting information associated with a user-selected service and
information associated with at least one service component of the user-selected service;
and (b) filtering only the at least one service component of the user-selected service
based on the extracted information.
[0032] It is to be understood that both the foregoing general description and the following
detailed description of the present invention are exemplary and explanatory and are
intended to provide further explanation of the invention as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0033] The accompanying drawings, which are included to provide a further understanding
of the invention and are incorporated in and constitute a part of this application,
illustrate embodiment(s) of the invention and together with the description serve
to explain the principle of the invention. In the drawings:
[0034] Figure 1 is a block diagram illustrating a DMB ensemble structure according to a
related art;
[0035] Figure 2 is a configuration diagram of a DMB transmission frame according to a related
art;
[0036] Figure 3 is a configuration diagram of an FIB structure shown in Figure 2 according
to a related art;
[0037] Figure 4 is a flow chart illustrating operations of an FIC decoder in accordance
with a preferred embodiment of the present invention;
[0038] Figure 5 is a configuration diagram of a specific field denoted by "FIG Type 0 field
for extension 1" (0/1) contained in an FIB of an FIC shown in Figure 4 in accordance
with a preferred embodiment of the present invention;
[0039] Figure 6 is a configuration diagram of a specific field denoted by "FIG Type 0 field
for extension 2" (0/2) contained in an FIB of an FIC shown in Figure 4 in accordance
with a preferred embodiment of the present invention;
[0040] Figure 7 is a configuration diagram of a specific field denoted by "FIG Type 0 field
for extension 3" (0/3) contained in an FIB of an FIC shown in Figure 4 in accordance
with a preferred embodiment of the present invention;
[0041] Figure 8 is a configuration diagram of a specific field denoted by "FIG Type 0 field
for extension 4" (0/4) contained in an FIB of an FIC shown in Figure 4 in accordance
with a preferred embodiment of the present invention;
[0042] Figure 9 is a configuration diagram of an FIDC contained in an FIB of an FIC shown
in Figure 4 in accordance with a preferred embodiment of the present invention; and
[0043] Figure 10 is a block diagram illustrating a DMB receiver in accordance with a preferred
embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0044] Reference will now be made in detail to the preferred embodiments of the present
invention, examples of which are illustrated in the accompanying drawings. Wherever
possible, the same reference numbers will be used throughout the drawings to refer
to the same or like parts.
[0045] Figure 4 is a flow chart illustrating operations of an FIC decoder according to the
present invention. Referring to Figure 4, the FIC decoder waits for a host to select
one of the services contained in an ensemble at step 401. If the host selects one
of the services, the FIB decoder decodes a specific field "FIG type 0 field for extension
1" (0/1) contained in a FIB, and analyzes a sub-channel structure (i.e., a service
component) at step 402. If a specific field "FIG type 0 field for extension 2" (0/2)
is enabled, the FIC decoder decodes only information associated with the selected
service, and recognizes a structure of the selected service at step 403. Subsequently,
if a field "FIG type 0 field for extension 3" (0/3) and another field "FIG type 0
field for extension 4" (0/4) are enabled, the FIC decoder decodes only information
associated with the selected service component. These specific fields (0/1 to 0/4)
can be contained in one same FIB or different FIBs of a FIC, and will be explained
later in detail. Accordingly, the FIC decoder filters only a desired service component
among the FIDC and the MSC using the above-mentioned decoded information, and transmits
the filtered result to the next component block (e.g., a TP decoder) at step 405.
In other words, the FIC decoder transmits a desired service component to the host
according to the filtered data types, and transmits the same to a TP decoder and to
an audio decoder and/or a video decoder.
[0046] Individual FIG types shown in Table 1 above can be extended according to individual
types. For example, if a FIG type is set to zero (0), it can be extended to 32 FIG
types (e.g., 32 extensions for FIG type 0). The number of currently-used FIG types
(extensions) among the above 32 FIG types is set to 30. 30 FIG types are currently
adapted to indicate configuration information of individual ensembles, a sub-channel
content, and paging, etc.
[0047] In this case, the MCI indicating the ensemble structure information, individual services,
and service component information is transmitted to a destination using a FIG type
of zero (0) contained in the FIG (i.e., in a FIG which is identified as the FIG type
0).
[0048] Figure 5 is a configuration diagram of a specific field denoted by "FIG type 0 field
for extension 1" (0/1) indicative of sub-channel information (i.e., a service component),
which is contained in a FIB of a FIC, according to the present invention. Referring
to Figure 5, the FIC decoder analyzes information of the above-mentioned 0/1 structure,
such that it recognizes how many sub-channels are present in the MSC, and also recognizes
a start point depending upon individual sub-channel IDs (SubChID) and size information.
[0049] Figure 6 is a configuration diagram of a specific field denoted by "FIG type 0 field
for extension 2" (0/2) indicative of service information, which is contained in a
FIB of the FIC, according to the present invention. The number of service components
of individual services and data type information of the individual service components
can be recognized by examining the information in the "FIG type 0 field for extension
2". For example, in the 0/2 structure as shown in Figure 6, a "TMId" field of "00"
(i.e., TMId=00) is indicative of audio data of a DAB, and "TMId" of "01" is indicative
of a DMB data loading state. If "TMId" is set to "10", this means an FIDC, such that
data is loaded via the FIC instead of the MSC. If "TMId" is set to "11", this means
a packet data loading state.
[0050] Therefore, the FIC decoder may transmit service components to the host according
to individual data types, may transmit them to an audio decoder, or may transmit them
to a TP decoder.
[0051] Figure 7 is a configuration diagram of a specific field denoted by "FIG type 0 field
for extension 3" (0/3) indicative of information of a service component transmitted
under a packet mode according to the present invention. This 0/3 structure or field
is contained in a FIB of the FIC. If a current mode is determined to be a packet mode,
the FIC decoder may not recognize a sub-channel ID (SubChId) of a corresponding service
component in the field "FIG type 0 field for extension 2" (0/2), such that it must
recognize the sub-channel ID by decoding the 0/3 field. Also, the FIC decoder may
also recognize additional information other than the above-mentioned information as
necessary.
[0052] Figure 8 is a configuration diagram of a specific field denoted by "FIG Type 0 field
for extension 4" contained in an FIB of the FIC, indicative of information of a service
component transmitted under a stream mode, according to the present invention. A service
component corresponding to a stream mode employs a SCCA to recognize CA information,
such that it must decode the field "FIG Type 0 field for extension 4" (0/4).
[0053] In this manner, the FIC decoder decodes the MCI loaded via the above-mentioned 0/1,
0/2, 0/3, and 0/4 fields or structures, and can filter data loaded via the FIC and
the MSC. In this case, the FIDC may be transmitted to the FIC.
[0054] Figure 9 is a configuration diagram of a FIDC according to the present invention.
Referring to Figure 9, 3 bits of a "TCId" field and 3 bits of an extension field are
indicative of an "FIDCId" of the "FIG Type 0 field for extension 2" (0/2) field. Therefore,
using this information, the FIC decoder can filter only an FIDC equal to the FIDCId,
and does not filter the remaining FIDC(s).
[0055] If the MSC data is equal to a sub-channel ID recognized by decoding the field "FIG
type 0 field for extension 2" (0/2), that MSC data is filtered, such that the filtered
result is transmitted to a corresponding component block.
[0056] Figure 10 is a block diagram illustrating a DMB receiver according to the present
invention. The method of Figure 4 is implemented by the DMB receiver of Figure 10,
but can be implemented by other suitable device or system. All the components of the
DMB receiver are operatively coupled.
[0057] Referring to Figure 10, upon receiving a Eureka-147 stream, an FIC decoder 111 filters
only service components contained in a user-selected service using MCI received via
the above-mentioned FIG 0/1, 0/2, 0/3, and 0/4 fields of the FIB contained in the
FIC. The FIC decoder 111 transmits the filtered service components to a host 100 according
to individual data types, or transmits them to a TP decoder 112. If video data and
audio data are included in the service components, the TP decoder 112 separates the
video data from the audio data, outputs the video data to a video decoder 113, and
outputs the audio data to an audio decoder 114. The results of the video decoder 113
and the audio decoder 114 are appropriately output, e.g., through a display and a
speaker, respectively. If only one of the video data and the audio data is present
in the service components, the TP decoder 112 outputs the present data to a corresponding
decoder. For example, if an audio signal is only present in the service components,
the TP decoder 112 outputs the audio signal to the audio decoder 114.
[0058] It should be noted that most terminology disclosed in the present invention is defined
in consideration of functions of the present invention, and can be differently determined
according to intention of those skilled in the art or usual practices. Therefore,
it is preferable that the above-mentioned terminology be understood on the basis of
all contents disclosed in the present invention.
[0059] The present invention has been disclosed in the above-mentioned preferred embodiments,
such that those skilled in the art may easily modify the above-mentioned preferred
embodiments according to technical scope and difficulty of the present invention.
Therefore, it should be understood that other preferred embodiments and modification
based on technical contents of the present invention belong to the scope of the appended
claims of the present invention.
[0060] As apparent from the above description, a mobile broadcast receiver and a method
for decoding a broadcast service according to the present invention do not decode
all information associated with an ensemble composed of a plurality of services in
an FIC decoder of a DMB receiver, but decode only information associated with a user-desired
service, such that the FIC decoder can easily and quickly extract service components.
[0061] It will be apparent to those skilled in the art that various modifications and variations
can be made in the present invention without departing from the spirit or scope of
the inventions. Thus, it is intended that the present invention covers the modifications
and variations of this invention provided they come within the scope of the appended
claims and their equivalents.
1. A mobile broadcast receiver comprising:
a receiver to receive a fast information channel (FIC) and a main service channel
(MSC); and
an FIC decoder to analyze fast information group (FIG) information of a fast information
block (FIB) contained in the FIC, to extract information associated with a user-selected
service and information associated with at least one service component of the user-selected
service, and to filter only the at least one service component of the user-selected
service based on the extracted information.
2. The mobile broadcast receiver according to claim 1, wherein the at least one service
component includes individual sub-channels of the MSC and a fast information data
channel (FIDC) of the FIC.
3. The mobile broadcast receiver according to claim 1, wherein the FIC decoder analyzes
multiplex configuration information (MCI) contained in at least one FIG type 0 field
of the FIG information, and thereby extracts the information associated with the user-selected
service and the information associated with the at least one service component of
the user-selected service.
4. The mobile broadcast receiver according to claim 3, wherein the at least one FIG type
0 field includes a 'FIG type 0 field for extension 1' field, a 'FIG type 0 field for
extension 2' field, a 'FIG type 0 field for extension 3' field, and a 'FIG type 0
field for extension 4' field.
5. The mobile broadcast receiver according to claim 4, wherein the FIC decoder decodes
the 'FIG type 0 field for extension 1' field to analyze a user-selected sub-channel
structure on the basis of the decoded result, and decodes the 'FIG type 0 field for
extension 2' field to analyze a user-selected service structure on the basis of the
decoded result.
6. The mobile broadcast receiver according to claim 4, wherein the FIC decoder decodes
only information of a service component contained in the user-selected service by
examining the 'FIG type 0 field for extension 3' field, when a service component transmission
is performed under a packet mode.
7. The mobile broadcast receiver according to claim 4, wherein the FIC decoder decodes
only information of a service component contained in the user-selected service by
examining the 'FIG type 0 field for extension 4' field, when a service component transmission
is performed under a stream mode.
8. The mobile broadcast receiver according to claim 4, wherein the FIC decoder filters
only the user-selected service among a fast information data channel (FIDC) of the
FIB contained in the FIC using the decoded results of the fields 'FIG type 0 field
for extension 1' ~ 'FIG type 0 field for extension 4', and filters only a sub-channel
contained in the user-selected service among individual sub-channels of the MSC.
9. The mobile broadcast receiver according to claim 1, wherein the FIG information includes
a FIDC (fast information data channel) identification field for identifying a FIDC
associated with the user-selected service, and based on the FIDC identification field,
the FIC decoder filters only the FIDC corresponding to the FIDC identification field.
10. A method for decoding a broadcast service of a mobile broadcast receiver, which receives
a fast information channel (FIC) and a main service channel (MSC), the method comprising:
(a) analyzing fast information group (FIG) information of a fast information block
(FIB) contained in the FIC, and extracting information associated with a user-selected
service and information associated with at least one service component of the user-selected
service; and
(b) filtering only the at least one service component of the user-selected service
based on the extracted information.
11. The method according to claim 10, wherein the at least one service component includes
individual sub-channels of the MSC and a fast information data channel (FIDC) of the
FIC.
12. The method according to claim 10, wherein the step (a) includes:
analyzing multiplex configuration information (MCI) contained in at least one FIG
type 0 field of the FIG information, and thereby extracting the information associated
with the user-selected service and the information associated with the at least one
service component of the user-selected service.
13. The method according to claim 12, wherein the at least one FIG type 0 field includes
a 'FIG type 0 field for extension 1' field, a 'FIG type 0 field for extension 2' field,
a 'FIG type 0 field for extension 3' field, and a 'FIG type 0 field for extension
4' field.
14. The method according to claim 13, wherein the step (a) includes:
(a1) decoding the 'FIG type 0 field for extension 1' field to analyze a user-selected
sub-channel structure on the basis of that decoded result, and
(a2) decoding the 'FIG type 0 field for extension 2' field to analyze a user-selected
service structure on the basis of that decoded result.
15. The method according to claim 14, wherein the step (a1) decodes the 'FIG type 0 field
for extension 1' field and thereby detects a variety information of the user-selected
service component including a unique number, a start position in the MSC, and size
information.
16. The method according to claim 14, wherein the step (a2) decodes the 'FIG type 0 field
for extension 2' field and thereby detects a number of service components associated
with the user-selected service and data type information of those service components.
17. The method according to claim 13, wherein the step (a) includes:
if a service component transmission is performed in a packet mode, decoding only information
of a service component contained in the user-selected service by examining the 'FIG
type 0 field for extension 3' field.
18. The method according to claim 13, wherein the step (a) includes:
if a service component transmission is performed in a stream mode, decoding only information
of a service component contained in the user-selected service by examining the 'FIG
type 0 field for extension 4' field.
19. The method according to claim 13, wherein the step (b) includes:
filtering only the user-selected service among a fast information data channel (FIDC)
of the FIB contained in the FIC using the decoded results of the fields 'FIG type
0 field for extension 1' ~ 'FIG type 0 field for extension 4', and
filtering only a sub-channel contained in the user-selected service among individual
sub-channels of the MSC.
20. The method according to claim 10, wherein the FIG information includes a FIDC (fast
information data channel) identification field for identifying a FIDC associated with
the user-selected service, and the step (b) includes filtering only the FIDC corresponding
to the FIDC identification field.